Lifting jack



Feb. 10, 1-925. 1,526,153

J. R. KINNEY LIFTING' JACK Filed Feb. 28, 1924 Mentor: Jwsbzafl/Jfiamay,

Patented Feb. 10, 1925 JUSTUS R. KIIQ'NEY, OF JAMAIGA PLAIN, MASSACHUSETTS.

marine more Application filed. February 28, 1924. Serialllo. 695,860.

To all whom; it may concern "Be itlmown that I, JUsTUs R. Klnivnna citizen of the United States of America,.and a resident of Jamaica Plain, in the county of gut-Folk, in the State of Massachusetts, have invented certain; new and useful lmi [HWY-79111611138111 Lifting Jacks, ofwhich the 'ioilowing is a specification.

lhis invention relates to lifting jacks and pz'articularly to devices of this character adapted for use in connectionwith motor vehicles.

'llheobject of the invention is the production of a litting ack which is provided with an out-hoard support adapted to be lowered sufficiently to permit its insertion beneath thed nzle of a, motor vehicle provided with balloon tires When a tire is deflated.

The invention consists primarily of a vertical rack; having a carriage adaptedto be moved lengthwise of said rack; said carriage having mounted thereon a pinion coacting with the teeth of said rack and driving mechanism for said pinion.

The invention further consists of certain novel features of construction and; arrangement of parts which will be understood read ily by reference to the description of the drawings and to the claims to behereinafter given. i v

F or the purpose ofillustrating the invention, one preferred form thereof is illustrated in the drawings, this form having been found to give satisfactory and reliable results although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organized and the invention is not limited to the precise arrangement and organ ization of these instrumentalities as herein shown and described except as required by a front elevation of The side. plates 12 have a pivot; pin-13 mounted therein extending through=;tl 1 e;lowe1: end of a rack 14 which may be ofany desired length.

The rack 14 is-provided witlnteeth 15 on one face and with these teeth 15. mesh. the teeth of; a pinion 16 formed upon a revoluble shaft 17 rotatable in -bearings in the side walls of a carriage 18 adapted to bemoved endwise of said rack, 14.

The carriage 18 consists of a U-shaped plate having mounted in itsopenwend a} pin 19 on which is a roller 20 the periphery of which bear-sagainst the rearsface-21 ofthe rack-Maud, prevents the'earriage 18 from tilting when afweight is disposedupon its outwardly extending support 22.

The upper end otathe outwardly extend? ing support 22 is concaved as indicated at23 and when an axle. A is positionedjthereon said axle will bear against the vertical wall 24 of the said carriage 18. This concaved end 23 of. support 22 prevents the; accidental displacement of the axle A whenlonce posie tioned upon said support.

The worm gear 251 is fixedly secured to one end of the shaft 17 and this worm gear meshes with a worm 26 fixedly, securedto an actuating shaft 27.n1ounted in. bearings in ears 28 ye rrtending outwardly from one side wall ofthe carriage 18.

Pivotally secured to one end of the actuating shaft 27 is a rod 29 by means of which the shaft- 27 may be rotated in any well known manner.

The shaft 17 has secured thereto a collar 30 which with the gear 25 at its opposite end prevents end movement of said shaft.

The carriage 18 is also provided with another roller 31 which travels over the ends of the teeth 15 and assists in preventing the tilting of the carriage 18 when supporting a load.

By making a pivotal connection between the base 10 and the lower end of the rack 14 the base may rest upon uneven ground and the rack maintained in a vertical position.

It will be noted that the support 22 is at one side of the vertical rack 14 and when a load is positioned thereon the tendency would be to tilt the carriage 18 thereby causing it to bind upon the rack and prevent free movement of the carriage 18 on the rack 14.

The rollers 20, 31 effectually prevent this binding of the carriage 18 upon said rack 14 and permit the carriage to move freely.

The roller 20 may be used alone if desired, but preferably the roller 31 is also used.

The support 22 may be lowered to a point near the base 10 and then inserted beneath the axle A of a vehicle the tire of which is deflated and if the worm 27 is then rotated, rotary movement will be imparted to the shaft 17 through the worm gear 25 thereby causing the carriage 18 to be raised or lowered as desired.

lVhen the load upon the support 22 is in raised position it will be retained in this position by the engagement of the teeth of the worm gear 25 with the thread of the worm 26. y

The pitch of the thread of worm. 26 is such as to prevent the rotation of the worm by the tendency of the worm gear 25 to rotate when a load is on the support 22.

Each side wall of the carriage 18 has a flanged collar 32 mounted therein with the inner ends thereof contacting with the side walls of the rack 1 lthereby preventing any lateral movement of the carriage 18 as it travels up and down the rack 14.

The device is constructed at a minimum cost but is very effective when in opera tion.

It is believed that the operation and many advantages of the invention will be apparent without further description.

Having thus described my invention, 1 claim 1. The combination of a base; a rack secured at its lower end to said base; a carriage movable endwise on said rack and having an outwardly extending support; a

shaft mounted in hearings in the side walls of said carriage; a pinion thereon coacting with said rack; means mounted on said carriage for rotating said shaft; and collars on said shaft at opposite ends of said pinion having peripheral flanges coacting with the sides of said rack.

2. The combination of a base; a rack secured at its lower end to said base and provided with an unbroken back face extending from side to side thereof; a carriage movable endwise on said rack and having an outwardly extending support; a shaft mounted in bearings in the side walls of said carriage; a pinion thereon coact ing with said rack; means mounted on said carriage for rotating said shaft; and a roller at the upper end of said carriage coacting with the back face of said rack.

3. The combination of a base; a rack secured at its lower end to said base; a carriage movable endwise on said rack and having an outwardly extending support; a shaft mounted in bearings in the side walls of said carriage; a pinion thereon coacting with said rack; means mounted on said carriage for rotating said shaft; and two rollers on said carriage at different levels, the lower roller coacting with the front face of said rack; and the upper one coacting with the back face of said rack.

Signed by me at 746 Old South Buildin Boston, Massachusetts, this 27th day of February, 1924.

JUSTUS R. KINNEY.

Witnesses WALTER E. LOMBARD. NATHAN C. LOMBARD. 

